Install libslang2 by entering the following commands in the terminal:
sudo apt update sudo apt install libslang2
Description:
S-Lang programming library - runtime version
S-Lang is a C programmer's library that includes routines for the rapid development of sophisticated, user friendly, multi-platform applications. . This package contains only the shared library libslang.so.* and copyright information. It is only necessary for programs that use this library (such as jed and slrn). If you plan on doing development with S-Lang, you will need the companion -dev package as well.
Homepage: http://www.jedsoft.org/slang/
Version: 2.3.1a-3ubuntu1
Section: libs